I use it for my .204's & really like it. Seems to burn clean & really runs slick through my powder dispenser! I know you were wanting experience through a .223, but I don't have any. I would recommend XTerminator.
I might just try this very same powder in my newly acquired .17 Rem, also!
I've used it for the last several years....Below is a couple of groups when I was building test loads for my .223 slow twist AR with 40gr V-Max bullets...
I also use Winchester 748 with good results...Ramshot is a little less expensive and burns a little cleaner...
I like it well enough to have used up two 8lb jugs and a few 1 lbs containers. I use it in .223. I also use 748 and H4895 for .223. X-terminator and 748 meter very well. Try a pound [ if you can find it ] I think you will like it.
I am about halfway thru an 8 lb jug as well and that's after buying a half dozen or so 1lber's.
I load .223 and 6X45 with it. Works great in the 17 Fireball as well.